HP 9133D Manual page 16

TROUBLESHOOTING
12 Floppy Format
13 WD1010 Check
14 WD1100 Check
15 WD1100 Data
Buffer RAM
Test
Additional Hints
The disc is re-initialized with a 011 data
pattern.
All read/write registers on the WD1010 are
checked.
Writes data pattern to all registers with all
combinations and verifies the data.
Test the WD data buffer RAM
At power on, if the unit does not respond to commands, the fault LED can be used to locate a failing
section of the
peA.
The LED will respond in one of the following ways:
- LED
0
n sol
i
d I ~I
LED blinks off once
every 6 seconds
LED b lin k s
0
f
of
2
times/6 seconds
LED b lin k s
0
f
of
3
times/6 seconds
- LED blinks off 4
times/6 seconds
- LED blinks off 5
times/6
sl~conds
NOTE
6809 is bad
ROM checksum is wrong
Processor ram is bad
Buffer ram is bad
Configuration jumpers
A thru H set wrong
8291 is bad
If you are experiencing DISC COMPATIBILITY problems (Flexible Disc Drive), procede to the: AD-
JUSTMENTS section that follows only after you have verified that a known good formatted Flexible
Disc presents the same symptoms. This type of problem may mean that the Phase Lock Loop (PLL) has
drifted out of tolerance.\NEED 10
Adjustments
The PLL, Read Pulse Width (RPW), and Write Pulse Width (WPW) adjustments are performed as follows.
The PLL adjustment should be performed when the unit exhibits read/verify errors or fails the VERIFY
test (TEST 10). The RP\V and WPW adjustments are not recommended as they rarely drift, and are not
4-6